/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.mbeans;

import javax.management.Attribute;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.ReflectionException;
import javax.management.RuntimeOperationsException;
import javax.management.modelmbean.InvalidTargetObjectTypeException;

import org.apache.catalina.deploy.ContextResourceLink;
import org.apache.catalina.deploy.NamingResources;
import org.apache.tomcat.util.modeler.BaseModelMBean;

/**
 * <p>
 * A <strong>ModelMBean</strong> implementation for the
 * <code>org.apache.catalina.deploy.ContextResourceLink</code> component.
 * </p>
 * 
 * @author Amy Roh
 * @version $Revision: 467222 $ $Date: 2006-10-24 11:17:11 +0800 (星期二, 24 十月
 *          2006) $
 */

public class ContextResourceLinkMBean extends BaseModelMBean {

	// ----------------------------------------------------------- Constructors

	/**
	 * Construct a <code>ModelMBean</code> with default
	 * <code>ModelMBeanInfo</code> information.
	 * 
	 * @exception MBeanException
	 *                if the initializer of an object throws an exception
	 * @exception RuntimeOperationsException
	 *                if an IllegalArgumentException occurs
	 */
	public ContextResourceLinkMBean() throws MBeanException,
			RuntimeOperationsException {

		super();

	}

	// ----------------------------------------------------- Instance Variables

	// ------------------------------------------------------------- Attributes

	/**
	 * Set the value of a specific attribute of this MBean.
	 * 
	 * @param attribute
	 *            The identification of the attribute to be set and the new
	 *            value
	 * 
	 * @exception AttributeNotFoundException
	 *                if this attribute is not supported by this MBean
	 * @exception MBeanException
	 *                if the initializer of an object throws an exception
	 * @exception ReflectionException
	 *                if a Java reflection exception occurs when invoking the
	 *                getter
	 */
	public void setAttribute(Attribute attribute)
			throws AttributeNotFoundException, MBeanException,
			ReflectionException {

		super.setAttribute(attribute);

		ContextResourceLink crl = null;
		try {
			crl = (ContextResourceLink) getManagedResource();
		} catch (InstanceNotFoundException e) {
			throw new MBeanException(e);
		} catch (InvalidTargetObjectTypeException e) {
			throw new MBeanException(e);
		}

		// cannot use side-efects. It's removed and added back each time
		// there is a modification in a resource.
		NamingResources nr = crl.getNamingResources();
		nr.removeResourceLink(crl.getName());
		nr.addResourceLink(crl);
	}

}
